Subprocess Size in Hard Exclusive Scattering

Details Subprocess Size in Hard Exclusive Scattering Subprocess Size in Hard Exclusive Scattering

2002-10-08

arxiv.org/abs/hep-ph/0210124v2

Phys.Rev.D70:014001,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 4 figures, JHEP style; v2: quantitative estimate of Sudakov effects and more detailed discussion of endpoint behavio

Scientific paper

10.1103/PhysRevD.70.014001

The interaction region of hard exclusive hadron scattering can have a large transverse size due to endpoint contributions, where one parton carries most of the hadron momentum. The endpoint region is enhanced and can dominate in processes involving multiple scattering and quark helicity flip. The endpoint Fock states have perturbatively short lifetimes and scatter softly in the target. We give plausible arguments that endpoint contributions can explain the apparent absence of color transparency in fixed angle exclusive scattering and the dimensional scaling of transverse rho photoproduction at high momentum transfer, which requires quark helicity flip. We also present a quantitative estimate of Sudakov effects.

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